// 设置响应头
module.exports = async (ctx, next) => {
  const contentType = 'application/json; charset=utf-8';
  ctx.set('Content-Type', contentType);
  // ctx.response.body = '{"success": true}'
  // 跨域设置
  ctx.set("Access-Control-Allow-Origin", "*")
  ctx.set("Access-Control-Allow-Methods", "OPTIONS, GET, PUT, POST, DELETE")
  await next()
}